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1989 Fiscal Year Final Research Report Summary

Improved Plasma Confinement in ULQ Discharge

Research Project

Project/Area Number 63420050
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionFaculty of Engneering, University of Tokyo

Principal Investigator

INOUE Nobuyuki  University of Tokyo, Dept.Nucl.Engr., professor, 工学部, 教授 (60023719)

Co-Investigator(Kenkyū-buntansha) TOYAMA Hiroshi  University of Tokyo, Dept.Phys., Assistant professor, 理学部, 助教授 (50023718)
MIYAMOTO Kenro  University of Tokyo, Dept.Phys., professor, 理学部, 教授 (60023701)
MORIKAWA Junji  University of Tokyo, Dept.Nucl.Engr., Tech.Staf., 工学部, 教務職員 (70192375)
NIHEI Hitoshi  University of Tokyo, Dept.Nucl.Engr., Rec.Asoc., 工学部, 助手 (70010973)
YOSHIDA Zensho  University of Tokyo, Dept.Nucl.Engr., Assistant professor, 工学部, 助教授 (80182765)
Project Period (FY) 1988 – 1989
KeywordsULQ / Plasma / Nuclear Fusion / Plasma Confinement / Resistance Anomaly
Research Abstract

The ULQ configuration is a high-current and low-magnetic-field plasma equilibrium, which is expected to confine a high-beta plasma. The stable ULQ discharge condition was originally found by on the REPUTE-1 device at the University of Tokyo. After that, the plasma confinement characteristics have been studied in many different experiments, and basic scalings of confinement have been developed. In the present study, a higher-toroidal-field ULQ has been studied on a new device REPUTE-1Q.The maximum toroidal field is 0.7T,the maximum plasma current is 130kA,the major and minor radii are, respecively, 0.55m and 0.15m. Stable ULQ discharges are obtained with externally applied vertical field. No conducting shell is found to be necessary to stabilize the discharge. The effective plasma resistivity is reduced down to 3 m, which is about one half of the minimum value obtained in REPUTE-1, and significant improvement of the confinement is confirmed. REPUTE-1Q,can also be operated in the very low q (VLQ) regime of tokamak. Setup conditions for stable VLQ discharges have been studied. In the Hugill diagram to classify toroidal discharges, the ULQ and VLQ plasmas in REPUTE-1Q are lying in a relatively lower density and lower q regime. The experimental data obtained provide general understandings of discharge plasmas.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] N.Inoue: "Results of Ultra Low q and Reversed Field Pinch Experiments on REPUTE-1 and TORIUT-6" Proc.Internat.IAEA Conference,Nice,1988. 2. 671-676 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kamada: "Recent Results of Ultra Low q Experiments in TORIUT-6 and REPUTE-1" Nucl.Fusion. 29. 713-728 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Morimoto: "Bolometer Measurements of Ultra Low q and REP Plasma in REPUTE-1" Nucl.Fusion. 29. 1171-1174 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Z.Yoshida: "Setup Conditions for Very Low q Tokamak Discharges" Nucl.Fusion. 30(to be published). (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Inoue, et al.: "Results of Ultra Low q and Reversed Field Pinch Experiments on REPUTE-1 and TORIUT-6" Proc.Internat.IAEA C Conference, Nice, 1988. 2. 671-676 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kamada, et al.: "Recent Results of Ultra Low q Experiments in TORIUT-6 and REPUTE-1" Nucl.Fusion. 29. 713-728 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Morimoto, et al.: "Bolometer Measurements of Ultra Low q and RFP Plasma in REPUTE-1" Nucl.Fusion. 29. 1171-1174 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Z.Yoshida, et al.: "Setup Conditions for Very Low q Tokamak Discharges" Nucl.Fusion. 30 (to be published). (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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